Electrode plate and rechargeable battery including the same

Abstract

An embodiment of the present disclosure provides an electrode plate including: a substrate; an active material layer on at least a portion of one surface of the substrate and having a multi-stage end portion; and a protective member on at least a portion of the multi-stage end portion of the active material layer and on the substrate such that the protective member does not protrude past the active material layer in a thickness direction.

What is claimed is: 
     
         1 . An electrode plate comprising:
 a substrate;   an active material layer on at least a portion of one surface of the substrate and having a multi-stage end portion; and   a protective member having one side on at least a portion of the multi-stage end portion of the active material layer and another side on the substrate such that the protective member does not protrude past the active material layer in a thickness direction.   
     
     
         2 . The electrode plate as claimed in  claim 1 , wherein:
 the active material layer comprises:   a first active material portion; and   a second active material portion comprising:
 an edge portion along an edge of the first active material portion and on which one surface of the protective member is provided, and 
 a multi-stage portion having a size corresponding to the first active material portion, on the first active material portion, and being higher in height than the edge portion. 
   
     
     
         3 . The electrode plate as claimed in  claim 2 , wherein:
 an outer surface of the protective member is on a same line as an outer surface of the edge portion of the second active material portion.   
     
     
         4 . The electrode plate as claimed in  claim 2 , wherein:
 the first active material portion and the second active material portion are made of the same material.   
     
     
         5 . The electrode plate as claimed in  claim 2 , wherein:
 an outer surface of the protective member is relatively lower than an outer surface of the edge portion of the second active material portion.   
     
     
         6 . The electrode plate as claimed in  claim 2 , wherein:
 the edge portion of the second active material portion has a thickness corresponding to a thickness of the first active material portion.   
     
     
         7 . The electrode plate as claimed in  claim 1 , wherein:
 the protective member has a thin film shape.   
     
     
         8 . The electrode plate as claimed in  claim 1 , wherein:
 the protective member is a lamination tape.   
     
     
         9 . The electrode plate as claimed in  claim 1 , wherein:
 an edge of the active material layer is spaced apart from an edge of the substrate.   
     
     
         10 . The electrode plate as claimed in  claim 1 , wherein:
 the active material layer comprises a positive electrode active material.   
     
     
         11 . The electrode plate as claimed in  claim 10 , wherein:
 the positive electrode active material is one selected from a lithium manganese-based oxide, a lithium nickel-based oxide, a lithium cobalt-based oxide, a lithium nickel manganese-based oxide, a lithium nickel cobalt manganese-based oxide, a lithium nickel cobalt aluminum-based oxide, a lithium iron phosphate-based compound, a lithium manganese phosphate-based compound, a lithium cobalt phosphate-based compound, and a lithium vanadium phosphate-based compound.   
     
     
         12 . The electrode plate as claimed in  claim 1 , wherein
 the active material layer comprises a negative electrode active material.   
     
     
         13 . The electrode plate as claimed in  claim 12 , wherein:
 the negative electrode active material is a material in which lithium ions are able to be intercalated and deintercalated, and   the negative electrode active material is one selected from a carbon-based material such as crystalline carbon, amorphous carbon, a carbon composite, and a carbon fiber, a lithium alloy, silicon (Si), and tin (Sn).   
     
     
         14 . A rechargeable battery comprising:
 an electrode assembly comprising a plurality of electrode plates and a separator, wherein the plurality of electrode plates are stacked with the separator therebetween; and   a case that accommodates the electrode assembly,   each of the plurality of electrode plates is the electrode plate as claimed in  claim 1 .